Most of you have probably heard of Amanda (Advanced Maryland Automatic Network Disk Archiver) the backup utility, originally developed by the University of Maryland.  Zmanda took the popular Amanda Open Source project and supercharged it, targeting the SMB space as a lower cost alternative to the traditional options; I think they may be onto something.  The Open Source project that really intrigues me is Cleversafe.  The concept is extremely interesting in an era where disaster recovery is in the forefront of every users mind.  I can see a number of applications for Cleversafe, today we have RAID (Redundant Array of Independent Disks), Sync and Async Remote Mirroring, RAIN (Redundant Array of Independent Nodes) and Cleversafe may be onto what I would call RAIS (Redundant Array of Independent Sites) the ultimate in protection for the geographically dispersed enterprise.  I will keep a close watch on the progress of the Cleversafe project but I would recommend checking out Zmanda and Cleversafe.